A Bronx elementary school with lead contamination in its air ducts is expected to reopen tomorrow – but angry parents fear going to the school will still prove dangerous to their kids.

When students show up at PS 37 in Kingsbridge this morning, they’ll be bused to other area schools while air ducts in the building are scrubbed clean of lead particles, which can cause brain damage.

Officials said they’ll re-test for lead, then reopen the building.

“They’re going to open the school even though they know it isn’t safe,” charged Parents Association President Myrna Calderon. “What politician is going to stand up for these children?”

Parents first alerted officials to high lead levels last week after confirming reports that the school was built in 1994 on land that was saturated with chemicals from the gas station and railroad yard that previously occupied the property.

They also fear construction work for an Emergency Medical Service garage next door might be hurling dangerous particles into the air.

Parents and school board members met at the school yesterday to discuss the problem and were told by an expert that their clean up tactics may not do the trick.

“Only a small amount of lead can wreak havoc,” said Megan Charlop of Montefiore Hospital. “And the levels were 1,000 to 3,000 times too high in the air ducts.”